They could've done so much more with Vanko. Completely wasted his potential. They set him up so perfectly in the opening scenes of the film - his obsession and brilliance was exhibited with such pathos, and his conversation about Stark coming from "a family of thieves and butchers". Looking at the trailers, I thought it would be about him blowing the doors wide open on the closet of skeletons that was Tony's and his father's weapons manufacturing legacy and show that a man can't escape his past so easily. Instead, they turned him into a cartoon character. Utter disgrace.